Brian Pearson
Melbourne specific temperature/humidity sensor
Dependencies: EALib EthernetInterface SHTx mbed-rtos mbed
Revision 0:4bbf12d35a8c, committed 2016-05-06
- Comitter:
- BPPearson
- Date:
- Fri May 06 10:19:50 2016 +0000
- Commit message:
- First revision - Melbourne specifics
;
Changed in this revision
diff -r 000000000000 -r 4bbf12d35a8c EALib.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EALib.lib Fri May 06 10:19:50 2016 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/embeddedartists/code/EALib/#74540582e639
diff -r 000000000000 -r 4bbf12d35a8c EthernetInterface.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetInterface.lib Fri May 06 10:19:50 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/EthernetInterface/#d1ccbed7687a
diff -r 000000000000 -r 4bbf12d35a8c SHTx.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SHTx.lib Fri May 06 10:19:50 2016 +0000 @@ -0,0 +1,1 @@ +https://developer.mbed.org/users/BPPearson/code/SHTx/#189a7d9ddc40
diff -r 000000000000 -r 4bbf12d35a8c main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri May 06 10:19:50 2016 +0000
@@ -0,0 +1,446 @@
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "QSPIFileSystem.h"
+#include "SHTx/sht15.hpp"
+
+
+#define ECHO_SERVER_PORT 7
+#define on 0
+#define off 1
+#define DESIRED_SIZE_IN_MB (1)
+
+// devices
+Serial pc(USBTX, USBRX); // tx, rx
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+DigitalIn ipReset(p23,PullUp);
+QSPIFileSystem qspifs("qspi");
+SHTx::SHT15 sensor(p32, p31);
+EthernetInterface eth;
+TCPSocketServer server;
+TCPSocketConnection client;
+Ticker oneSecondTick;
+DigitalOut hostQueryLED(p24);
+DigitalOut timingPulse(p25);
+
+// variables
+char ipStr[20];
+char subnetStr[20];
+char gatewayStr[20];
+char inBuff[256];
+char outBuff[256];
+float currTemperature = 25.4;
+float currHumidity = 78.3;
+int flashLedCnt = 4;
+int cnt = 0;
+bool sensorCommsFault;
+int ipResetCount = 0;
+
+// procedure declarations
+void initSensor();
+void readSensor();
+void oneSecondTimer();
+bool readConfigFile();
+void writeConfigFile();
+void processRcvBuffer(char *inBuff);
+
+
+
+int main()
+{
+ char *macAddr;
+ //char *hello = "Hello\n";
+
+ // get mac address and print it to PC
+ //macAddr = eth.getMACAddress();
+ //pc.printf("MAC address %s\n", macAddr);
+
+ // check if file system already formatted
+ if (!qspifs.isformatted())
+ { pc.printf("Format qspi file system\n");
+ qspifs.format(DESIRED_SIZE_IN_MB);
+ }
+
+ // try to read config file which contains the IP address, subnet and gateway
+/* if (readConfigFile())
+ {
+ pc.printf("Config file ethernet details\n %s\n %s\n %s\n", ipStr, subnetStr, gatewayStr);
+ // set IP address from config file
+ eth.init(ipStr, subnetStr, gatewayStr);
+ }
+ else
+ {
+ pc.printf("default ethernet address\n");
+ // set to a default IP address, subnet and gateway
+ strcpy(ipStr, "10.39.123.123");
+ strcpy(subnetStr, "255.255.0.0");
+ strcpy(gatewayStr,"10.39.1.1");
+
+ // initialise the IP stack to these defaults
+ eth.init(ipStr, subnetStr, gatewayStr);
+
+ // save default settings as working config
+ writeConfigFile();
+ }
+*/
+
+ eth.init(); //Use DHCP
+ eth.connect();
+
+ // get mac address and print it to PC
+ macAddr = eth.getMACAddress();
+ pc.printf("MAC address %s\n", macAddr);
+
+ pc.printf("IP Address is %s\n", eth.getIPAddress());
+
+ // turn off all the leds on the chip
+ led1 = 1;
+ led2 = 1;
+ led3 = 0;
+ led4 = 0;
+
+ // bind to the required port
+ server.bind(ECHO_SERVER_PORT);
+
+ // put into listen mode
+ server.listen();
+
+ // initialise the sensor
+ initSensor();
+
+ // start the one second tick that does periodic tasks such as read the sensor and toggle the activity LED
+ oneSecondTick.attach(&oneSecondTimer, 1);
+
+ // do forever
+ while (1)
+ {
+ // configure stack ready to accept a client connection
+ server.accept(client);
+
+ // wait for a connection request from the client (receipt of a packet)
+ client.set_blocking(true, 0);
+
+ // get received packet from client
+ int n = client.receive(inBuff, sizeof(inBuff));
+
+ // process the request from the client
+ processRcvBuffer(inBuff);
+
+ // close the client connection
+ client.close();
+
+ // pulse LED 4 to show ethernet activity
+ hostQueryLED = 0;
+ wait(0.1);
+ hostQueryLED = 1;
+
+ //pc.printf("Sensor update\n");
+ //pc.printf("Temp %5.1f, Humidity %5.1f\n", currTemperature, currHumidity );
+ }}
+
+
+
+void initSensor()
+{
+
+ // reset sensor just to check if it can be communicated with (returns true)
+ if (sensor.reset())
+ {
+ sensorCommsFault = false;
+ pc.printf("Sensor reset\n");
+
+ // set temperature in celcius
+ sensor.setScale(false);
+
+ // optimise speed of sensor
+ if (!sensor.setOTPReload(false))
+ {
+ sensorCommsFault = true;
+ pc.printf("Set OTP reload\n");
+ }
+
+ // set resolution to high (14 bits for temperature, 12 bits for humidity)
+ if (!sensor.setResolution(false))
+ {
+ sensorCommsFault = true;
+ pc.printf("Set resolution\n");
+ }
+ }
+ else
+ {
+ sensorCommsFault = true;
+ pc.printf("Sensor comms fault\n");
+ }
+}
+
+
+void readSensor()
+{
+ bool goodRead = false;
+
+ if (!sensorCommsFault)
+ {
+ timingPulse = 1;
+
+ goodRead = sensor.update();
+
+ timingPulse = 0;
+
+ // trigger a measurement
+ if (goodRead == true)
+ {
+ // get temperature in celcius
+ currTemperature = sensor.getTemperature();
+
+ // get relative humidity
+ currHumidity = sensor.getHumidity();
+ }
+ else
+ {
+ currTemperature = -1.0F;
+
+ currHumidity = -1.0F;
+ }
+
+ }
+ else // return error values
+ {
+ currTemperature = -1.0F;
+
+ currHumidity = -1.0F;
+ }
+}
+
+
+
+void oneSecondTimer()
+{
+
+ // if end of pulse sequence and LED still lit
+ if (flashLedCnt == 0 && led4 == 1)
+ {
+ // turn off LED
+ led4 = 0;
+ }
+
+ // if location LED still requires pulsing
+ if (flashLedCnt > 0)
+ {
+ // toggle the LED indicator
+ led4 = flashLedCnt & 1;
+
+ // decrement the count
+ flashLedCnt--;
+ }
+
+ // check if user pushbutton pressed (low)
+ if (ipReset == 0)
+ {
+ // increment the counter
+ ipResetCount++;
+
+ // turn on a LED for seconds 1 to 4
+ switch (ipResetCount)
+ {
+ case 1:
+ led1 = 0;
+ break;
+ case 2:
+ led2 = 0;
+ break;
+ case 3:
+ led3 = 1;
+ break;
+ case 4:
+ led4 = 1;
+ break;
+ case 5:
+ // turn off all the leds on the chip to indicate change of IP address
+ led1 = 1;
+ led2 = 1;
+ led3 = 0;
+ led4 = 0;
+ break;
+ default: ;
+ }
+
+ // if button pressed for 5 seconds
+ if (ipResetCount >= 5)
+ {
+ // initialise the IP address back to the default value
+ strcpy(ipStr, "10.39.123.123");
+ strcpy(subnetStr, "255.255.0.0");
+ strcpy(gatewayStr,"10.39.1.1");
+
+ // save to config file
+ writeConfigFile();
+ }
+ }
+ else
+ {
+ // reset the counter
+ ipResetCount = 0;
+
+ // turn off all the leds on the chip
+ led1 = 1;
+ led2 = 1;
+ led3 = 0;
+ led4 = 0;
+ }
+}
+
+
+bool readConfigFile()
+{
+ int digits;
+ int octet1, octet2, octet3, octet4;
+ bool ipOk = false;
+ bool subnetOk = false;
+ bool gatewayOk = false;
+
+ // open file pointer to config data
+ FILE *fp = fopen("/qspi/config.dat", "r");
+
+ // if open successful
+ if (fp != NULL)
+ {
+ // read 20 byte blocks for each parameter
+ fread(ipStr, 20, 1, fp);
+ fread(subnetStr, 20, 1, fp);
+ fread(gatewayStr, 20, 1, fp);
+
+ // close the file pointer
+ fclose(fp);
+
+ // break the IP address down to individual octets and return number of octets read
+ digits = sscanf(ipStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ // check if 4 octets and all within range
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ ipOk = true;
+
+ // break the subnet down to individual octets and return number of octets read
+ digits = sscanf(subnetStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ // check if 4 octets and all within range
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ subnetOk = true;
+
+ // break the gateway down to individual octets and return number of octets read
+ digits = sscanf(gatewayStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ // check if 4 octets and all within range
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ gatewayOk = true;
+
+ // if IP address, subnet and gateway valid
+ if (ipOk && subnetOk && gatewayOk)
+ return true;
+ else
+ return false;
+ }
+ return false;
+}
+
+
+
+void writeConfigFile()
+{
+
+ // open file pointer to config data file
+ FILE *fp = fopen("/qspi/config.dat", "w");
+
+ // if valid handle returned
+ if (fp != NULL)
+ {
+ // write the IP address, subnet and gateway as 3 twenty byte blocks
+ fwrite(ipStr, 20, 1, fp);
+ fwrite(subnetStr, 20, 1, fp);
+ fwrite(gatewayStr, 20, 1, fp);
+
+ // close the file handle
+ fclose(fp);
+ }
+}
+
+
+
+
+
+
+void processRcvBuffer(char *inBuff)
+{
+ int digits;
+ int octet1, octet2, octet3, octet4;
+ bool ipOk = false;
+ bool subnetOk = false;
+ bool gatewayOk = false;
+ char *cPtr = outBuff;
+
+ switch (inBuff[0])
+ {
+ case 'r': // return temperature and humidity readings
+
+ readSensor();
+
+ // get temperature and humidity in a string
+ sprintf( cPtr, "%5.1f\n%5.1f\n", currTemperature, currHumidity );
+
+ // send readings back to client
+ client.send_all(outBuff, strlen(outBuff));
+ break;
+ case 'i': // could be id or ip
+ switch (inBuff[1])
+ {
+ case 'd': // flash a led to identify this device
+ flashLedCnt = 10;
+ break;
+ case 'p': // set the IP address to that contained in this packet
+ // split packet up into seperate strings - ip add, subnet and gateway
+ sscanf(inBuff, "ip %s\n%s\n%s", ipStr, subnetStr, gatewayStr);
+
+ //pc.printf("ip %s\nSubnet %s\ngateway %s\n", ipStr, subnetStr, gatewayStr);
+
+ // check if ip address valid
+ digits = sscanf(ipStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ ipOk = true;
+
+ //pc.printf("ip %d.%d.%d.%d\n", octet1, octet2, octet3, octet4 );
+
+ // check if subnet valid
+ digits = sscanf(subnetStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ //pc.printf("subnet %d.%d.%d.%d\n", octet1, octet2, octet3, octet4 );
+
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ subnetOk = true;
+
+ // check if gateway valid
+ digits = sscanf(gatewayStr, "%d.%d.%d.%d", &octet1, &octet2, &octet3, &octet4);
+
+ //pc.printf("gateway %d.%d.%d.%d\n", octet1, octet2, octet3, octet4 );
+
+ if (digits == 4 && octet1 >=0 && octet1 < 256 && octet2 >=0 && octet2 < 256 && octet3 >=0 && octet3 < 256 && octet4 >=0 && octet4 < 256)
+ gatewayOk = true;
+
+ // if all valid
+ if (ipOk && subnetOk && gatewayOk)
+ {
+ //pc.printf("Changing IP settings\n");
+
+ // save to config file
+ writeConfigFile();
+ }
+ break;
+ default: ;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
diff -r 000000000000 -r 4bbf12d35a8c mbed-rtos.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Fri May 06 10:19:50 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#13a25134ac60
diff -r 000000000000 -r 4bbf12d35a8c mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri May 06 10:19:50 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file